Henry mather



H. MATHER.

r Gate-Valve.

Patented Mar. 23, 17880..

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NPETERS, PHDTCvLITHOGRAPHER. WASHINGDH E b UNITED STATES PATENT OEEIcE.

HENRY MATHER, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF F HIS RIGHT TO JAMES BRYAN, OF SAME PLAGE.

GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 225,711, dated March 23, 1880. Application filed July 24, 1879.

To all whom it may concern Be it known that I, HENRY MATHER, of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Gate -Yalves, of which the following1 is a specification.

This invention relates to certain improvements in that class of gate-valves in which the faces of the gate arc automatically forced to their seats by means of oppositely-inelined planes on their adjoining surfaces when the gate or valve is forced home by the valve-stem.

The object of this invention is to provide a gate-valve in which the valve is ot' two parts and the valve-seats opposite and parallel to each other with means for guiding the parts of the valve to their seats when the gate or valve is inserted in its chamber, thereby saving a great deal of time and trouble in readzo justin g the parts of the valve when they have been separated for cleaning or any other purpose.

In the drawings, Figure l represents a longitudinal sectional view of my improved gatevalve; Fig. 2, detached perspective views of the disks forming the gate. Fig. 3 is a crosssectional perspective view on a plane through the middle of the gate-chamber; Fig. 4, de-A tached perspective views of the packing-seat, packing, and confining-ring, and a diametric section of the recessed head of the valve-stem casing.

The letter A indicates the valve-chamber, which is of the usual construction 5 and B, the valve-seats, which are directly opposite and parallel to each other, and located, respectively, at the induction and eduction ports of the valve-chamber.

The letter C indicates the gate or valve, consisting of two circular disks, c c', of such diameter as to cover and close the induction and eduction ports of the valve-chamber when forced home against their seats. rlhe disk c is provided with an inclined or beveled couveX projection, d, on its inner face, and the disk c on its inner face with an oppositely-inclined concave projection, d. Each disk is provided at the top with a recess, c, in which a shoulder, D, on the valve-stem E is adapted to engage, in order to move the disks simultaneously in a straight line away from each other, so as to im pin ge closely and evenly7 upon the seats B.

The letter F indicates two inclined. guides on opposite sides of the valve-chamber above the valve-seats B, the object of which is to guide the valve to its seat when it is first inserted in the valve-chamber, and prevent the two parts from spreading when the valve is raised to renew the packing of the valve-stem, as more fully hereinafter explained.

The letter G indicates a shoulder formed on the valve-stem, and H an annular packing surrounding said valve-stem above the shoulder, and setting in a recess, I, of the casing, in which it is conned by means of a ring, K, which is held in place by the screw-cap L.

Resting against the inner wall or shoulder of the annular recess I is an annular plate or ring, M, which serves as a seat for the said packing.

The object ofthe shoulder on the valve-stem is to strike the plate or ring M and force it and the packing out of the recess I when it is toV be renewed, and thus obviate the necessity of picking it out by inea-ns of a sharp or pointed instrument, which is a tedious and inconvenient operation, and is liable to injure the surrounding metal.

The annular packing is beveled on top and flat on the bottom, the beveled top portion resting on a correspondingly-shaped recess in the eonning-ring K, by means of which it is securely forced against its seat, and said packing is preferably constructed of a compound of rubber and plumbago.

The convex and concave projections on the adjoining faces of the respective disks bear against each other, and are adapted to work together to force the disks apart against their respective seats when the gate or valve is forced home by the valve-stem.

The valve-stem is provided with a male screw-thread, which worksin a female screwthread in the cap of the valve-chamber, as usual.

I am aware that a gate-valve has been constructed with a chamber having walls and valve-seats inclined toward each other from the entrance of said chamber, and that the in- IOO clination of said wall causes the parts of the valve to slide to their seats; but these seats are also inclined, and therefore necessitate a peculiar construction and action of the spin- 5 dle in order to force them to their seats. I do not claim this construction.

What I claim is In lcombination with the valve C, constructed in two parts, with inclined bearing-faces,

1o and the valve-rod, the valve-chamber A, having parallel valve-seats and provided at its upper part with the inclined guides F, for guiding the valve to its seat during,` its insertion, substantially as specified. 15

In testimony that I claim the foregoing I have hereunto set lnyhand and seal in the presence of the subscribing witnesses.

HENRY MATHEE. [L s] Witnesses:

MICHAEL CoNLiN, PETER H. J oBEs. 

